Managed Extensibility Framework

I'd say it took me about an hour to implement MEF, and then I spent most of it making my loadable modules look good in my form (I'm not an Art Designer...). Verdict: Love. A colleague and I are writing a Business Administration Application that will be shipped with one piece of functionality, but that we expect will grow over time. Thusly, I have converted it from a Main-Form-with-a-Child-Form piece of work (very tightly coupled) to a ... Main-form-that-can-load-"any"-module-into-its-UI solution. Changes:

1. Added a reference to System.ComponentModel.Composition to my project
2. Created a new Class Library ("Modules") with a single interface: "IModule"
3. Referenced my Class Library project from my main project
4. Revamped the Main(string[]) code:
     Application.EnableVisualStyles();
     Application.SetCompatibleTextRenderingDefault(false);
     var mainForm = new ApplicationWindow();
   
     var container = new CompositionContainer(new DirectoryCatalog("."));
     var batch = new CompositionBatch();
     batch.AddPart(mainForm);
     container.Compose(batch);
   
     Application.Run(mainForm);
   
5. Added an Import statement to my ApplicationWindow:
     [Import]
     private IEnmerable modules { get; set; }
   
6. Added an interface implementation to my ApplicationWindow:
     public partial class ApplicationWindow : Form, INotifyImportSatisfaction
   
7. Fullfilled the interface:
     public void ImportCompleted()
     {
       foreach (var module in modules)
       {
         var item = menu.Items.Add(module.Namn);
         item.ToolTipText = module.Description;
         item.Tag = module;
         item.Click += OpenModule;
       }
     }
   
8. Exported my sole module:
     [Export(typeof(IModule))]
     public partial class wizLäggTillFordonsfabrikat : Form, IModul
   

Done! Check out MEF at CodePlex: http://mef.codeplex.com/